纳米CeO2的表面改性及其在聚丙烯中的分散性研究

选用4种不同的偶联剂以无水乙醇为溶剂对纳米氧化铈进行表面处理,测定处理好的样品分别在环己烷中的分散性.选择经不同偶联剂处理过的样品在环己烷体系中分散效果最好的比例与聚丙烯切片共混,在扫描电镜上观察共混物断面纳米CeO2的分散情况.结果表明,表面处理有利于纳米氧化铈在聚丙烯中的分散,其中以钛酸酯3#比例为8%时处理的效果最好.钛酸酯3#处理后样品的红外光谱表明,纳米CeO2与偶联剂发生了化学键合作用,它们之间并不是简单的物理包覆.

Surface Modification of Cerium Oxide Nanoparticles and Its Dispersion in Polypropylene

The cerium oxide nanoparticles were treated by four kinds of coupling agents in the alcohol. The dispersion of cerium oxide nanoparticles treated in cyclohexane was measured. The appropriate propotion of samples treated in cyclohexane was choosed, and blend them with polypropylene, then observe the dispersion of cerium oxide nanoparticle in section of compounds on SEM. The results show that surface modification benefits the dispersion of cerium oxide nanoparticles in polypropylene and the effect of No.3 titanate with the amount of 8% was the best one. The infrared spectrum of sample treated with No.3 titanate shows that new chemical bond between CeO_2 and coupling agents forms and the effect is not a simply physical coating.